Move MOSFET changes above #include for RIGIDBOARD

Correction to #5629

Marlin/pins_RIGIDBOARD.h

   #define Z_MIN_PROBE_PIN  19    // Z-MAX pin J14 End Stops
 #endif
 
+//
+// MOSFET changes
+//
+#define RAMPS_D10_PIN       9 // EXTRUDER 1
+#define MOSFET_D_PIN       12 // EXTRUDER 2 or FAN
+
 #include "pins_RAMPS.h"
 
 //
 //
 // Heaters / Fans
 //
-#define RAMPS_D10_PIN       9 // EXTRUDER 1
-#define MOSFET_D_PIN       12 // EXTRUDER 2 or FAN
-
 #undef  HEATER_BED_PIN
 #define HEATER_BED_PIN     10